G5 Weighing Instrument
2-3
input. Note that terminal 26 is not the grounding point of the load cell cable but it will
extend the shield into the ground plane of the input circuit. Terminal 26 is not
connected to the ground of the instrument.
Communication
External computing devices connected to the communication interfaces of the
instrument have to comply with the standard, UL 60950.
RS422/RS485
The serial communication is made for 2-wire or 4-wire with common 0 V. This is a
SELV/SELV-E circuit.
It can be used for serial communication to computer/PLC (Modbus RTU) or a printer.
Connections are made to terminals 1 – 5. Shielded cable must be used. Shield can be
connected to terminal 6 unless grounded in other point.
The communication lines must be terminated in both ends. Termination switches are
set as shown in the table below:
DIP switch settings
2wire DIP-switches T DIP-switches
R DIP-switches
2-wire with termination
ON (x2)
ON (x2)
OFF (x2)
4-wire with termination
OFF (x2)
ON (x2)
ON (x2)
2-wire without termination
ON (x2)
OFF (x2)
OFF (x2)
4-wire without termination
OFF (x2)
OFF (x2)
OFF (x2)
Example of DIP-switch settings.
4-wire with termination
!
1. Tx-
2. Tx+
3. Rx-
4. Rx+
5. Com
6. Shield
1. Tx-
2. Tx+
3. Rx-
4. Rx+
5. Com
6. Shield
RS485, 2-wire
RS422, 4-wire
Summary of Contents for G5
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